diff options
author | Juan Castillo <juan.castillo@arm.com> | 2015-08-12 12:53:02 +0100 |
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committer | Juan Castillo <juan.castillo@arm.com> | 2015-11-27 09:34:20 +0000 |
commit | 9784dbda1147458598f1d586d8242332ada19b44 (patch) | |
tree | ad063ae078c5439aa43e7741d687880f569ba142 /include/plat/arm/board | |
parent | dc2d4038b9c95b8509eb7df82d02911d2843528f (diff) |
Add basic NOR flash driver for ARM platforms
FVP and Juno platforms include a NOR flash memory to store and
load the FIP, the kernel or a ramdisk. This NOR flash is arranged
as 2 x 16 bit flash devices and can be programmed using CFI
standard commands.
This patch provides a basic API to write single 32 bit words of
data into the NOR flash. Functions to lock/unlock blocks against
erase or write operations are also provided.
Change-Id: I1da7ad3105b1ea409c976adc863954787cbd90d2
Diffstat (limited to 'include/plat/arm/board')
-rw-r--r-- | include/plat/arm/board/common/drivers/norflash.h | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/include/plat/arm/board/common/drivers/norflash.h b/include/plat/arm/board/common/drivers/norflash.h new file mode 100644 index 00000000..0bf35a50 --- /dev/null +++ b/include/plat/arm/board/common/drivers/norflash.h @@ -0,0 +1,68 @@ +/* + * Copyright (c) 2015, ARM Limited and Contributors. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * Redistributions of source code must retain the above copyright notice, this + * list of conditions and the following disclaimer. + * + * Redistributions in binary form must reproduce the above copyright notice, + * this list of conditions and the following disclaimer in the documentation + * and/or other materials provided with the distribution. + * + * Neither the name of ARM nor the names of its contributors may be used + * to endorse or promote products derived from this software without specific + * prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +#ifndef __NORFLASH_H_ +#define __NORFLASH_H_ + +#include <stdint.h> + +/* First bus cycle */ +#define NOR_CMD_READ_ARRAY 0xFF +#define NOR_CMD_READ_ID_CODE 0x90 +#define NOR_CMD_READ_QUERY 0x98 +#define NOR_CMD_READ_STATUS_REG 0x70 +#define NOR_CMD_CLEAR_STATUS_REG 0x50 +#define NOR_CMD_WRITE_TO_BUFFER 0xE8 +#define NOR_CMD_WORD_PROGRAM 0x40 +#define NOR_CMD_BLOCK_ERASE 0x20 +#define NOR_CMD_LOCK_UNLOCK 0x60 + +/* Second bus cycle */ +#define NOR_LOCK_BLOCK 0x01 +#define NOR_UNLOCK_BLOCK 0xD0 + +/* Status register bits */ +#define NOR_DWS (1 << 7) +#define NOR_ESS (1 << 6) +#define NOR_ES (1 << 5) +#define NOR_PS (1 << 4) +#define NOR_VPPS (1 << 3) +#define NOR_PSS (1 << 2) +#define NOR_BLS (1 << 1) +#define NOR_BWS (1 << 0) + +/* Public API */ +void nor_send_cmd(uintptr_t base_addr, unsigned long cmd); +int nor_word_program(uintptr_t base_addr, unsigned long data); +void nor_lock(uintptr_t base_addr); +void nor_unlock(uintptr_t base_addr); + +#endif /* __NORFLASH_H_ */ + |